Grinding-mill



(No Model.) 2 Sheets-Sheet 1. A. J. ROBINSON.

GRINDING MILL. No. 470,601. I Patented Mar. 8, 1892.

THE Nunms versus co., mourn-mo., WASHINGTON, u. c.

(No Model.) l 2 Sheets-Sheet 2;

A. J. ROBINSON.

GRINDING MILL.

No. 470,601. Patented Mar. 8, 1892.

NITED STATES PATENT OFFICE.

AARON JjROlNSON, OF FREMONT, NEV HAMPSHIRE.

GRlNDlNG-MILL.

SPECIFICATION forming part of Letters Patent No. 470,601, dated March 8, 1892.

Application filed d' une 2. 1891. Serial No. 394,881. (No model.)

To a/ZZ whom t may concern.:

Be it known that I, AARON J. ROBINSON, of Fremont, in the county of Rockingham and State of New Hampshire, have invented a new and useful Improvement in Grinding-Mills, of which the following is a specification.

The object of my inventionl is to insure the grinding-plates being 'kept in true planes, or the grinding-faces thereof parallel with each other, and of such form as to increase their grinding capacity over those of a similar construction heretofore employed and now in use for grinding corn and similar grain or other substance; and it consists in the construction, combination, and arrangement of the different parts of the mill, as hereinafter more fully described, and specifically set forth'in the claims.

In the drawings hereto annexed, Figure l pepresents a vertical central longitudinal secufnal elevation of a grinding-mill constructed in accordance with my invention. Fig. 2 represents a vertical transverse section of the journal-bearing and supporting-frame, taken at the point indicated by the lines @c in Fig. l. Fig. 3 represents an elevation showing the face of one of the grinding-plates detached, drawn on an enlarged scale. Fig. 4 represents a section through one ot' the sections forming the disk of one of the grinding-plates,

lshowing the form of the radial cutting or grinding ribs. j

Reference being had to the drawings, which form a pa'rt of this specification, A represents the base or bed plate of the mill, which is constructed of cast-iron, forming a strong' rigid foundation, upon which are mounted and firmly secured the supports B by bolts C in the usual manner, as shown. j

Now in order that the two journal-bearings D D of each journal or axle E of the grinding-plates may be rigidly held or kept in true horizontal line with each other, l connect or form the same rigidly together by means of a yoke-frame F, cast in a continuous piece with bearings D D' at each end portion thereof, las shown in Fig. 1. These bearings are each provided with the common caps G, provided with oil-holes, and the said bearings D D with stufling-boxes, as usual, or oil-chainbers with wicks. To the inward ends of the said journals or axles E are secured the cirin contact.

able manner, as desired, and are each provided with radial grinding-ribs K and circular feeding-ribs J, formed and arranged as hereinafter described. Now it will be evident that it is very essential that the grindingplates shall be very nicely adjusted as respects their grinding-faces and that the same shall be kept exactly parallel and in true position with each other, in order that the opposite grinding-plates may have their faces brought close `together when running at a high rate of speed without liability of coming desired result by forming the journal-bearsupports B, and connect the same therewith adjustably by means of the several set-screw bolts I, as shown in Fig. 2.

To provide against injury to the faces of the grinding-plates in case a nail, piece of iron, or other hard foreign substance should be accidentally placed in the hopper M with the grain or material to be ground, I provide a bracket N at the outward end of the journal or axle E, containing a spiral spring O, adj usted by a suitable set-screw P and seated at its opposite end or having a bearing against the friction-plug Q, which contacts with the end of the said journal or axle E, which axle is provided with a collar R to prevent movement in the opposite direction longitudinally by contact with the end of the inward journalbearing D', as shown. The said inward journal-bearings D are secured to the vertical hangers or supports S, which are secured in I effect or producethis muchposition bythe bolts C', by bolts T, ther ineach provided with a suitable belt-pulley U, whereby the said grinding-plates may be rapidly revolved in opposite directions to grind the grain or other material placed in the hopper M and passing downward through the vert-ical chute V and entering between the grinding plates through the openings X, formed near the hub in one of the said circular disks II, carrying the said grinding-plates L, which are formed of suitably-hardened or tempered steel, their radial grinding-ribs K having inwardly-beveled cutting-edges in cross-section, as shown in Fig. 4, whereby the grinding is very muchl accelerated. The segmental feed-controlling ribs J, formed on the sections of the grinding-plates, do not coincide with the feed-ribs J on the adjacent grinding-plates, being in greater or less numbers on each alternate plate, as clearly shown in Fig. 3, which tends to prevent clogging or feeding too rapidly to obtain the best results. It is important and essential that the successful operation of this class of grindingmills is enhanced by setting up and retaining or keeping the bed-plate and the journals, shafts, or axles of the same perfectly true and level, which can be easily ascertained by applying thereon a spirit-level or providing one therewith in any suitable manner desired.

Having thus described my invention, I claim- 1. In a grinding-mill, the combination, with the shaft E, having section grinding-plates L, provided with inwardly-beveled grinding-ribs K, of the connecting yoke-frame F and journal-bearings D D', each formed in one contin uous.,piece, supports B, having vertical and horizontal set -screws I, and the supports S, having the pivot-bolts T, substantially as described.

2. The combination, with the shaft E, having grinding-plates L, of the connecting yokeframe F and journal-bearings D D', adjustably mounted within the supports B, having the vertical and horizontal adjusting setscrews I, and the supports S,having pivot-bolts T, whereby the said bearings may be kept in true line and the grinding-plates in position, as described, as and for the purposes set forth.

3. The adjacent section grinding-plates L, having unequal segmental feed-ribs J and J', provided on each alternate plate extending around the outward portion of the face of the disk, substantiallyas shown anddescribed, as and .for the purposes set forth.

4. In a grinding-mill, the combination of the connecting yoke-frame F and journalbearings D D formed in one continuous piece, the journals E, and grinding-plates L, supports B, having adjusting set-screws I, and the supports S, having the pivot-bolts T, substantially as described.v

AARON J. ROBINSON. Witnesses:

SoPHRoNIA A. FoLLETT, IDA M. FoLLETT. 

